CN111535203A - Arch bridge turning construction method under steep slope terrain condition - Google Patents
Arch bridge turning construction method under steep slope terrain condition Download PDFInfo
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- CN111535203A CN111535203A CN202010404057.3A CN202010404057A CN111535203A CN 111535203 A CN111535203 A CN 111535203A CN 202010404057 A CN202010404057 A CN 202010404057A CN 111535203 A CN111535203 A CN 111535203A
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- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/08—Methods or apparatus specially adapted for erecting or assembling bridges by rotational movement of the bridge or bridge sections
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Abstract
The invention relates to the technical field of bridge engineering, in particular to an arch bridge turning construction method under a steep slope terrain condition. According to the method, the assembling of the arch ribs is transferred to the ground according to the terrain conditions of local conditions, single-rib swivel closure is carried out, aerial assembling at the designed installation position is avoided, high-altitude operation is reduced, construction risks are reduced, the segmental assembling positioning accuracy and construction quality are improved, the height of an assembling support can be reduced through single-rib swivel, the structural weight of swivel construction is reduced, construction materials are saved, meanwhile, large-amount mountain excavation and ecological damage can be avoided, the construction difficulty and safety risks are effectively reduced, the construction period is shortened, the limitation of terrain topography to engineering is reduced to the greatest extent, the economical efficiency is good, and the method has great popularization significance in steep slope topography in complex mountainous areas.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to an arch bridge turning construction method under a steep slope terrain condition.
Background
With the gradual extension of traffic networks to areas in the midwest, more and more bridge projects are provided for crossing deep-mountain canyons in complex and difficult mountainous areas, and arch bridges are bridge types which are most suitable for construction. However, due to the complex terrain conditions, the construction environment is severe, the construction difficulty and the construction cost are increased greatly, and great challenges are brought to the construction.
At present, the construction of large-span arch bridges in mountainous areas can generally adopt a cable hoisting inclined pulling buckling hanging method or a rotating construction method. Under the steep slope topographic condition in complicated mountain area, on the hunch seat was located the slope, the longitudinal bridge was to the slope that is great slope with the cross bridge, to the oblique pull buckle method of hanging, the anchor system and the hoisting platform of buckling the system are difficult to set up, and high altitude construction time is long simultaneously, receives long-term gorge wind load effect to influence great, is difficult to guarantee construction quality. The rotary construction method is developed in nearly 40 years, and successively invents a method combining a horizontal rotation method, a vertical rotation method and horizontal rotation and vertical rotation, wherein the horizontal rotation method is to adopt a plane rotary body to rotate a structure to a designed bridge axis to close after a half arch is formed at a certain angle deviated from the bridge axis according to a designed line shape, the vertical rotation method is to adopt a vertical rotation method to vertically rotate the structure to a designed height to close after a low bracket is adopted at the bridge axis to assemble arch ribs, and the horizontal rotation and vertical rotation method is a method combining the characteristics of the horizontal rotation and the vertical rotation, but is limited by steep mountains and valleys.
Disclosure of Invention
The invention aims to overcome the defects of high construction difficulty and safety risk, long construction period, large mountain excavation amount, high construction cost and the like in the arch bridge construction under the steep slope terrain condition in the prior art, and provides a turning construction method of an arch bridge under the steep slope terrain condition.
In order to achieve the purpose, the invention provides the following technical scheme:
an arch bridge turning construction method under the condition of steep slope terrain comprises the following steps:
a. according to the design, respectively excavating a foundation pit at the corresponding position of each arch rib, constructing a lower rotary table, a horizontal rotation mechanism and an upper rotary table, and respectively setting up corresponding arch rib assembling supports;
b. correspondingly mounting a vertical rotation hinge, a buckling tower and a vertical rotation cable on the upper turntable, and respectively assembling the arch rib on the corresponding vertical rotation hinge and the corresponding arch rib assembling support;
c. the arch rib swivel construction is carried out to a design position and the arch rib opposite to the opposite bank is closed, wherein the swivel construction of the arch rib close to the mountain side comprises the steps of frame releasing, vertical swivel lifting to a preset position, horizontal swivel to the mountain side to a design axis position and vertical swivel lowering to a design elevation; the turning construction of the arch rib on the outer side of the mountain comprises frame removal, vertical turning lifting to a design elevation and horizontal turning to a design axis position towards the outer side of the mountain;
d. and sealing the lower rotary table and the upper rotary table to form an arch base, fixedly connecting the vertical rotary hinges, and installing a cross brace and a bridge surface beam between the two arch ribs to finish the construction of the arch bridge.
The arch rib close to the mountain side is an arch rib component located in the uphill direction of the mountain, the arch rib close to the mountain side needs to climb over the mountain when rotating flatly, and the arch rib on the outer side of the mountain is an arch rib located in the downhill direction of the mountain, namely, the landforms on two sides have height differences.
The arch bridge turning construction method under the steep slope terrain condition comprises the steps of a, enabling single ribs to independently use the lower rotary table, the flat turning mechanism, the upper rotary table and the arch rib assembling support, eliminating a connection beam between arch seats required by the whole turning body compared with the whole turning body, saving construction materials, respectively arranging the independent arch rib assembling support for the single ribs, respectively arranging supports with proper heights according to the terrain heights of the two arch ribs, compared with the prior art that the whole arch ribs are directly assembled, effectively reducing the heights and the consumption of the supports, saving cost, facilitating positioning and installation of the corresponding arch ribs, then using the single ribs as turning units, turning the arch ribs on the mountain side to the designed axis position in the uphill direction in the mode of vertical turning, flat turning and vertical turning, and turning the arch ribs on the mountain side to the designed axis position in the downhill direction in the mode of vertical turning and flat turning, when the two arch ribs are horizontally rotated, the upper rotary table rotates towards the space between the two arch ribs, so that the excavation of a mountain body is effectively avoided, the excavation risk is reduced, the environment is prevented from being damaged, the cost and the construction period are saved, the single-amplitude rotation construction of the arch ribs can effectively reduce the structural weight and reduce the difficulty of the rotation construction, the arch ribs are rotated to the design position through rotation to close the arch ribs corresponding to opposite banks, the sequence of the arch ribs close to the mountain side and the arch ribs outside the mountain side is not limited, then the lower rotary table and the upper rotary table are fixedly sealed to be used as arch bases, then the cross braces between the two arch ribs are installed to form the whole-amplitude arch ribs, the installation is convenient, the method is adopted to transfer the assembly of the arch ribs to the ground, and the single-rib rotation closure is carried out, the air assembly at the design installation position is avoided, the high-altitude operation is reduced, the risk is reduced, and the segment assembly positioning accuracy, the single-rib swivel can reduce the height of assembling the support, reduces the structural weight of swivel construction, saves construction materials, can avoid excavation and ecological destruction of a large amount of massifs simultaneously, effectively reduces the construction degree of difficulty and safety risk, shortens construction cycle, and furthest reduces the restriction of topography relief to the engineering, and economic nature is good, has great popularization meaning in the steep slope topography in complicated mountain area.
Preferably, the arch rib assembling support is arranged on a roadbed or an approach bridge behind the upper turntable.
Further preferably, in the step b, after the arch rib is assembled, an arch upper supporting frame is installed on the arch rib, a cable saddle is installed at the top of the buckling tower, and the vertical rotation cable is installed.
The height of the buckling tower is reduced, and the stress and deformation of the arch rib are reduced.
Preferably, the vertical rotation cable comprises a buckle cable and a balance cable.
Preferably, the horizontal rotation mechanism is arranged between the lower rotary disc and the upper rotary disc.
Preferably, the tail part of the upper rotary disc is provided with a rear anchor system, and the rear anchor system is used for anchoring the upper rotary disc during vertical rotation.
Further preferably, the rear anchor system comprises a prestressed rock anchor, a conversion block and finish-rolled deformed steel bar.
Preferably, in the step d, the wales and the bridge deck are installed by an arch crane.
Preferably, the turning construction of two opposite arch ribs on two banks is synchronously performed.
The simultaneous operation is not limited, but the simultaneous operation is performed in the same stage, so that the half arch rib is closed first, and then the other half arch rib is closed to achieve full-bridge closure.
In summary, compared with the prior art, the invention has the beneficial effects that:
1. by adopting the arch bridge swivel construction method under the steep slope terrain condition, the assembly of the arch ribs is transferred to the ground according to the terrain condition of local conditions, single-rib swivel closure is carried out, overhead assembly at the designed installation position is avoided, high-altitude operation is reduced, risks are reduced, the segment assembly positioning precision and construction quality are improved, the height of an assembly support can be reduced by the single-rib swivel, the structural weight of swivel construction is reduced, construction materials are saved, meanwhile, a large number of mountain excavation and ecological damage can be avoided, the construction difficulty and safety risks are effectively reduced, the construction period is shortened, the limit of terrain topography on engineering is reduced to the greatest extent, the economy is good, and the method has great popularization significance in steep slope terrain in complex mountainous areas.
Description of the drawings:
FIG. 1 is a schematic structural diagram of an arch bridge under steep slope terrain conditions in accordance with the present invention;
FIG. 2 is a schematic structural view of a sectional arch rib according to the present invention;
FIG. 3 is a schematic illustration of the vertical turn lift of the extrahill rib of the present invention;
FIG. 4 is a schematic illustration of the flat turning of the extramountain arch rib of the present invention;
FIG. 5 is a schematic illustration of the vertical turn lift of the backer side arch rib of the present invention;
FIG. 6 is a schematic illustration of the flat turning of the backer side arch rib of the present invention;
FIG. 7 is a schematic view of the vertical pivoting lowering of the backer side arch rib of the present invention;
fig. 8 is a schematic view of the arch rib closure of the present invention.
The labels in the figure are: 1-arch rib, 2-lower turntable, 21-rear anchor system, 3-upper turntable, 4-arch rib splicing support, 5-vertical rotary hinge, 6-buckle tower, 7-cross brace, 8-arch upper support frame, 91-buckle cable, 92-balance cable and 10-arch base.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1, an arch bridge (a suspender and a bridge surface beam are not shown) under the condition of a steep slope terrain, a main span is 252m, the full bridge is provided with two arch ribs 1, a plurality of cross braces 7 are arranged between the two arch ribs 1, the bridge spans a deep valley, mountain bodies on two sides of a bridge site are typical steep slope terrains in mountainous areas, arch bases 10 on two sides are located on the slopes in a longitudinal bridge direction and a transverse bridge direction, and the height difference of ground lines on two sides of the two arch ribs 1 on the same bank is large, so that the construction excavation amount is large, the construction site is limited, and the construction difficulty is increased steeply.
The invention relates to an arch bridge turning construction method under a steep slope terrain condition, which comprises the following steps:
a. according to design, respectively excavating foundation pits at corresponding positions of each arch rib 1, constructing a lower rotary table 2, a horizontal rotation mechanism and an upper rotary table 3, and respectively erecting corresponding arch rib assembling supports 4; the horizontal rotation mechanism comprises a spherical hinge, a supporting leg, a ring road and a traction cable counterforce seat;
b. correspondingly installing a vertical rotation hinge 5, a buckling tower 6 and a vertical rotation cable on the upper turntable 3, and respectively assembling the arch rib 1 on the corresponding vertical rotation hinge 5 and the corresponding arch rib assembling support 4;
c. the method comprises the following steps of constructing the arch rib 1 in a turning mode to a design position and closing the arch rib 1 opposite to a bank, wherein the turning construction of the arch rib 1 close to the mountain side comprises the steps of removing a frame, lifting the arch rib to a preset position in a vertical turning mode, horizontally turning the arch rib 1 close to the mountain side to a design axis position, and lowering the arch rib 1 close to the bank in the vertical turning mode to a design elevation; the turning construction of the arch rib 1 on the outer side of the mountain comprises frame removal, vertical turning lifting to a design elevation and horizontal turning to a design axis position towards the outer side of the mountain;
d. and sealing the lower rotary table 2 and the upper rotary table 3 to form an arch base 10, fixedly connecting the vertical rotary hinges 5, and installing a cross brace 7 and a bridge surface beam between the two arch ribs 1 to finish the construction of the arch bridge.
Specifically, as shown in fig. 2, a foundation pit is excavated at the corresponding position of two arch ribs 1 on the same shore, a lower rotary table 2, a horizontal rotation mechanism and an upper rotary table 3 are constructed, corresponding arch rib assembling supports 4 are erected respectively, the arch rib assembling supports 4 are arranged on a roadbed or an approach bridge behind the upper rotary table 3, the horizontal rotation mechanism is arranged between the lower rotary table 2 and the upper rotary table 3, a rear anchoring system 21 is arranged at the tail part of the upper rotary table 3, the rear anchoring system 21 is used for anchoring the upper rotary table 3 during vertical rotation, the rear anchoring system 21 comprises a prestressed rock anchor, a conversion block and finish-rolled threaded steel, a vertical rotation hinge 5, a buckling tower 6 and a vertical rotation cable are correspondingly arranged on the upper rotary table 3, the vertical rotation cable comprises a buckling cable 91 and a balance cable 92, the arch rib 1 is assembled on the arch rib assembling supports 4, one end of the arch rib 1 is connected to the vertical rotation hinge 5, then, an arch upper strut 8 is arranged on the arch rib 1, a cable saddle is arranged at the top of the buckling tower 6, and the vertical rotating cable is connected.
The single arch rib independently uses lower carousel 2, flat turn mechanism, last carousel 3 and arch rib assemble support 4, compare in the whole width of the body of turning, has cancelled the required hunch seat of the whole width of the body of turning inter-connection crossbeam, has saved construction material, can be according to two the support of suitable height is set up respectively to the topographic height of arch rib, effectively reduces the height of support, be convenient for location and installation correspond the arch rib reduces high altitude construction, reduces the construction risk.
After the assembling of the arch rib 1 is finished, the rear anchor system 21 is firstly tensioned to anchor the upper rotary table 3, and then the rotation construction is carried out on the arch rib 1. Specifically, the two arch ribs 1 are divided into a hill-side arch rib component and a hill-side arch rib component, the hill-side arch rib 1 is located in the uphill direction of the mountain, the hill-side arch rib 1 needs to climb over the mountain when rotating horizontally, and the hill-side arch rib 1 is located in the downhill direction of the mountain, namely, the two side terrains have height differences.
As shown in fig. 2, the rib 1 on the left side is the rib 1 on the outer side of the bank, and the rib 1 on the right side is the rib 1 on the opposite side of the bank. For the arch rib 1 on the outer side of the mountain, the tensioning force is started according to design calculation to synchronously tension the buckling rope 91 and the balance rope 92 in a grading manner until the arch rib 1 is separated from the arch rib assembling support 4, the support separation height is considered that the buckling rope 91 does not contact the support under the influence of daily temperature difference deformation, the support separation state is kept for more than 12h, and the condition of each part is confirmed. Then formally vertically rotating to make saidThe rib 1 is raised vertically to the design level as shown in figure 3. The vertical rotation should be started and braked at uniform speed, the angular speed is not more than 0.0025rad/min during the vertical rotation, and the acceleration is not more than 0.005m/s2After the vertical rotation is in place, the cable force is properly adjusted to enable the internal force of the arch rib 1-level buckle cable 91 to reach the ideal design state, and the vertical rotation lifting is completed. Confirm that the structure is in balanced state and after the axis and the elevation of rib 1 meet the requirements, right it consolidates to rotate perpendicularly hinge 5, carries out the flat turn, rib 1 rotates to design axis position through the downhill path direction, as shown in fig. 4, angular velocity is not more than 0.01rad/min during the flat turn, and acceleration is not more than 0.003m/s2When the flat turn is put in place, stop to pull, lean on inertial force to rotate, the inching is put in place at last, after rechecking elevation and axis, stretch-draw back anchor system 21, and will go up carousel 3 and lower carousel 2 and seal and form abutment 10, this step of pouring also can be with closure step parallel operation.
As shown in fig. 5, the same stripping step is also performed for the arch rib 1 on the side close to the mountain, and when the vertical rotation is lifted, the arch rib 1 needs to be rotated to a predetermined position so as to be able to climb over the mountain slope, and then the vertical rotation hinge 5 is temporarily fixed, as shown in fig. 6, the arch rib 1 is rotated to the designed axial position via the ascending direction, and the rest is required to be the same as before. Then, the temporary consolidation of the vertical rotation hinge 5 is released, vertical rotation lowering is performed, as shown in fig. 7, when each level of vertical rotation lowering is performed, a reasonable proportion of the two buckling cables 91 is kept, the elevations of the two transverse ends of the arch rib 1 are kept within an allowable range, after the axis and the elevation of the arch rib 1 are adjusted, the vertical rotation hinge 5 is consolidated, the rotation of the arch rib 1 close to the mountain side is completed, then the lower rotary table 2 and the upper rotary table 3 are sealed to form an arch base 10 (not shown), and the pouring step can also be performed in parallel with the closure step.
Then two arch ribs 1 opposite to each other on two banks are closed to form a half-width main arch, as shown in fig. 8. And the other half main arch is closed after the swivel construction is carried out according to the mode. Preferably, the turning construction of the arch ribs 1 opposite to each other on two banks is synchronously performed, and is not limited to be performed simultaneously, but is performed in the same stage, so that half arch ribs are closed first, and then the other half arch ribs are closed to achieve full-bridge closure. After the two arch ribs 1 are jointed, the cross brace 7 and the bridge deck beam are installed through an arch crane, and the construction of the arch bridge is completed, as shown in fig. 1.
The construction method utilizes the terrain conditions according to local conditions, the assembly of the arch ribs is transferred to the ground, the single-rib swivel closure is carried out, the aerial assembly at the designed installation position is avoided, the aerial operation is reduced, the risk is reduced, the segmental assembly positioning accuracy and the construction quality are improved, the height of an assembly support can be reduced through the single-rib swivel, the structural weight of swivel construction is reduced, construction materials are saved, meanwhile, the excavation and ecological damage of a large number of mountains can be avoided, the construction difficulty and the safety risk are effectively reduced, the construction period is shortened, the limitation of terrain topography on engineering is reduced to the maximum extent, the economy is good, and the method has great popularization significance in steep slope terrains in complex mountainous areas.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. An arch bridge turning construction method under the condition of steep slope terrain is characterized by comprising the following steps:
a. according to design, respectively excavating foundation pits at corresponding positions of each arch rib (1), constructing a lower turntable (2), a horizontal rotation mechanism and an upper turntable (3), and respectively erecting corresponding arch rib splicing supports (4);
b. a vertical rotation hinge (5), a buckling tower (6) and a vertical rotation cable are correspondingly arranged on the upper turntable (3), and the arch rib (1) is assembled on the corresponding vertical rotation hinge (5) and the corresponding arch rib assembling support (4) respectively;
c. the method comprises the following steps of constructing the arch rib (1) in a turning mode to a design position and closing the arch rib (1) opposite to a bank, wherein the turning construction of the arch rib (1) close to the mountain side comprises the steps of removing a frame, lifting the arch rib to a preset position in a vertical turning mode, horizontally turning the arch rib to the mountain side to a design axis position, and lowering the arch rib to a design elevation in the vertical turning mode; the turning construction of the arch rib (1) on the outer side of the mountain comprises the steps of removing the frame, lifting the frame to a design elevation through vertical turning and horizontally turning the frame to a design axis position towards the outer side of the mountain;
d. and sealing the lower rotary table (2) and the upper rotary table (3) to form an arch base (10), solidifying the vertical rotary hinges (5), and installing a cross brace (7) and a bridge surface beam between the two arch ribs (1) to finish the construction of the arch bridge.
2. A method according to claim 1, wherein the arch rib erection support (4) is provided on the roadbed or approach bridge behind the upper turntable (3).
3. Method according to claim 2, characterized in that in step b, after assembling the arch rib (1), an arch-up bracket (8) is mounted on the arch rib (1), a cable saddle is mounted on top of the buckle tower (6), and the riser cable is mounted.
4. A method according to claim 3, characterized in that the vertical rotation cables comprise a buckle cable (91) and a balancing cable (92).
5. Method according to claim 1, characterized in that the pan mechanism is provided between the lower turntable (2) and the upper turntable (3).
6. Method according to claim 1, characterized in that the upper turntable (3) is provided with a rear anchoring system (21) at the rear, which rear anchoring system (21) is used for anchoring the upper turntable (3) when turning vertically.
7. The method according to claim 6, characterized in that the rear anchor system (21) comprises prestressed rock anchors, conversion blocks and finish-rolled deformed steel.
8. Method according to any of claims 1-7, characterized in that in step d the wales (7) and the bridge deck are installed by means of an arch hoist.
9. A method according to any of claims 1-7, characterized in that the swivel constructions of two said ribs (1) lying opposite each other are carried out simultaneously.
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| CN202010404057.3A CN111535203B (en) | 2020-05-13 | 2020-05-13 | Arch bridge turning construction method under steep slope terrain condition |
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Cited By (1)
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| CN112459076A (en) * | 2020-11-17 | 2021-03-09 | 中铁二局集团有限公司 | Excavation method for arranging slag discharge access roads in steep cliff arch support slope area |
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